Frame-by-frame video image recording apparatus

ABSTRACT

A recording apparatus for recording a video image on a recording medium comprises a recording mechanism including a cathode-ray tube and pressure means for pressing the recording medium against a faceplate of the cathode-ray tube, and an electronic control means for controlling the recording mechanism. The control means includes a single-frame gate means adapted to be started by a start switch thereby energizing the cathode-ray tube to reproduce the video image on a desired single-frame, and feed means governed by the start switch for actuating a feeding element of the recording mechanism so as to effect timely feeding of the recording medium. This recording apparatus thus recording a video image signal frame-by-frame as above-described, the feeding rate of the recording medium need not be synchronized with the sweeping rate of a flying-spot on the faceplate.

United States Patent 1191 Kaneko et al.

[ 1 FRAME-BY-FRAME VIDEO IMAGE RECORDING APPARATUS [75] Inventors:Masahiko Kaneko; Hiroshi Miyama;

Jun Nishida, all of Kadoma, Japan [73] Assignee: Matsushita ElectricIndustrial Company, Limited, Osaka, Japan [22] Filed: June 7, 1971 [21]Appl. No.: 150,663

[30] Foreign Application Priority Data June 9, 1970 Japan 45/50084 July17, 1970 Japan.... 45/62981 July 17, 1970 Japan .1 45/62982 July 22,1970 Japan 45/64531 July 23, 1970 Japan.... 45/65300 Aug. 7, 1970Japan.'... 45/69452 Aug. 19, 1970 Japan 45/70379 Oct. 6, 1970 Japan45/88568 June 23, 1970 11 1 qs/ ogggg u July 21, 1970 Japan....HQZ/ZQLQQLU] Oct. 15, 1970 Japan.. W 5119392; [U]

[52] US. Cl 178/6.7 A, l78/6.6 R, l78/6.6 P, 346/74 CR, 346/110 R [51]Int. Cl. H04n 5/86 [58] Field of Search l78/6.6 R, 6.7 R, 178/6.7 A,6.61; 346/74 CR, 74 E, 74 ES, 110 V, 110 R [56] References Cited UNITEDSTATES PATENTS 3,571,503 3/1971 McMann, Jr. 178/6.7 A

[ Jan. 15, 1974 3,609,228 9/1971 Goldmark 178/6.7 A 3,619,483 11/1971Boots l78/6.7 A 3,555,177 1/1971 Tyler l78/6.7A 2,996,573 8/1961 Barnes346/74 CR 3,384,901 5/1968 Newberry 346/110 V 3,472,687 10/1969 Masuda346/74 CR Primary Examiner--Bernard Konick Assistant Examiner--StuartHecker Att0rneyRobert E. Burns and Emmanuel J. Lobato 5 7] ABSTRACT Arecording apparatus for recording a video image on a recording mediumcomprises a recording mechanism including a cathode-ray tube andpressure means for pressing the recording medium against a faceplate ofthe cathode-ray tube, and an electronic control means for controllingthe recording mechanism. The control means includes a single-frame gatemeans adapted to be started by a start switch thereby energizing thecathode-ray tube to. reproduce the video image on a desiredsingle-frame, and feed means governed by the start switchfor actuating afeeding'element of the re cording mechanism so as to effect timelyfeeding of the recording medium. This recording apparatus thus recordinga video image signal frame-by-frame as above-described, the feeding rateof the recording medium need not be synchronized with the sweeping rateof a flying-spot on the faceplate.

5 Claims, 20 Drawing Figures PATENTEDJANI 51914 3, 78s, 1 82 sun n1 0f1dPATENTEUJAN 1 51914 SHEET UEUF 14 PAIENTEUJW 519M 3, 786. 1 82 SHEET UHF14 93 68 6O 90 92 m 94 99 z Hfi 1 2 o-SEP l/ z AND; EH Draw- ST MONO 9798 SW MULT g 95 7O 96 (Millhlh-ilhiflflHL 1 l A I i B I (c) J1 IF [I H I1 I '(d) J -1 E j 1 (e) I] i i i TIME I I? (CITMZ PAIENIEDJAHISIEIM (0 Is T IbI M IdI M3 TIME VBF. GEN T84 I80 1 2 I77 I79 I81 R HB SEP GE VERSEP M IX SE P l73 INV PAIENIEDJANI 519M 3,786,182

' SHEET 09 0F 14 @0233 58 $052 @052 @258 fi $28 F 58 w 1 E3 :25 a m ZN QI @mm 1 ED L P9 My mam? 1 ED: 5 E23 FRAME-BY-FRAME VIDEO IMAGE RECORDINGAPPARATUS The invention relates to a recording apparatus and moreparticularly to a recording apparatus utilizing a cathode-ray tube, inwhich a radiation sensitive recording medium is placed on a faceplate ofthe cathode-ray tube for recording a video image reproduced thereon.

It is desired to record on a suitable medium a video image reproduced ona faceplate of a picture tube of a television receiver. A difficulty isexperienced in timely and appropriately recording such a video imagebecause the video image is drawn by a high speed flyingspot produced ina manner that an electron beam modulated and detected by a video imagesignal carrying the video image is bombarded onto a phosphorous surfaceof the faceplate. This makes it practically impossible to use a usualcamera for such recording purposes. An oscillographic recorder has beenrecently developed which uses a fiber optics cathode-ray tube forcontinuously recording high frequency signals for recording the videoimage. A problem is still encountered in regulating the feeding rate ofthe recording medium in order to synchronize it with the sweeping rateof the flying-spot. Furthermore, the recorder of the type tocontinuously record a video image is disadvantageous in that, where avideo image is to be reproduced by interlaced scanning, the video imageis recorded by field" but not by frame", failing to provide asatisfactory resoluting power. I

It is therefore a primary object of this invention to provide animproved video image recording apparatus which can timely andappropriately record a video image with a satisfactory resolution.

It is another object of this invention to provide an improved videoimage recording apparatus which records a video image in aframe-by-frame" fashion.

It is a further object of this invention to provide an improved videoimage recording apparatus which can record a TV video signal on arecording medium by a selected frame.

It is a still further object of this invention to provide a video imagerecording apparatus which can selec- 'tively record either positive ornegative video image.

It is a further object of this invention to provide a video imagerecorder which can selectively record either normal or horizontallyinverted video image on a recording medium It is a still further. objectof this invention to provide a video image recording apparatus which canrecord an enlarged video image on a recording medium.

The recording apparatus according to this invention utilizes acathode-ray tube preferably having a fiber optics faceplate the innersurface of which is coated with a phosphorous material. A video imagesignal source is provided which produces a video image signal mixed witha synchronizing pulse signal. The video image signal is applied to aseparator for separating the synchronizing pulse signal from the videoimage signal. The thus separated synchronizing pulse signal is appliedto a deflection signal generating means which produces deflectionsignals to be applied to the cathode-ray tube so as to vertically andhorizontally deflect an electron beam generated therein. Thesynchronizing pulse signal is also applied to a single-frame gate whichpermits the cathode-ray tube to reproduce adesired frame of video imagewhile being manually or automatically controlled. A recording mediumsensitive to radiation is pressed against the faceplate by a suitablemeans thereby positioning and fixing the medium to receive the radiationfrom the video image reproduced on the faceplate whereby the video imageis recorded on the recording medium in a frame-by-frame manner. It isapparent that the above-mentioned recording system of this invention isfree from the necessity of synchronizing the sweeping rate of theelectron beam and the feeding rate of the recording medium and need notskew correction".

In the drawings:

FIG. 1 is a perspective view of a video image recording apparatusaccording to this invention;

FIG. 2 is a rear end view of the apparatus with its back-board takenaway;

FIG. 3 is schematic cut-away view of a recording mechanism of therecording apparatus of FIGS. 1 and 2;

FIG. 4 is a schematic block diagram of a control circuit for therecording mechanism shown in FIG. 3;

FIG. 5 is a block diagram of a preferred form of a single-frame gateused in the control circuit of FIG. 4;

FIG. 6 is a diagram showing waveforms appearing in the single-frame gateof FIG. 5;

FIG. 7 is a preferred circuit arrangement of a motor control means inthe control circuit of FIG. 4;

' FIG. 8 is a diagram showing waveforms appearing in the circuit of FIG.7;

FIG. 9 is another form of the control circuit for the recordingmechanism of FIG. 3;

FIG. 10 is a block diagram of a video amplifier forming part of thecircuit of FIG. 9;

FIG. 11 is a front view of a faceplate of a cathode-ray tube of theapparatus using the circuit of FIG. 9;

FIGS. 12 to 15 are block diagrams of other forms of the control circuitfor the recording mechanism;

FIG. 16 is a front view of the faceplate of the cathode-ray tube showingan enlarged reproduction of a video image signal; and 4 FIGS. 17 and 18are block diagrams of still other forms of the control circuit for therecording mechamsm.

In FIG. 1, a preferred embodiment of a recording systern or apparatusaccording to this invention, shown at 10, is housed within a cabinet 11.This recording apparatus 10 has as a monitor tube TV picture tube havingafaceplate 12 which is exposed to the outsidethrough an opening 13provided in a front wall of the cabinet. A recording mechanism includinga cathode-ray tube is positioned at a suitable portion within thecabinet 11. In a suitable portion-of the front wall are placed aplurality of controls 14' to 17 for'controlling astigmatism, sweeptiming, intensity and focus, horizontal and verti cal positions, forinstance, of the picture tube and the cathode-ray tube. An aperture 18is formed in the front wall of the cabinet 10 through which a recordingmedium 19 recorded by the recording mechanism is delivered as shown.

FIG. 2 shows a rear side of the recording apparatus 10 with a protectionboard taken away. The recording mechanism indicated by 20 is positionedsidewise of the picture tube 21. An electronic control means covered bysuitable member 22 for controlling the recording mechanism is providedat a lower portion of the cabinet 11.

FIG. 3 shows in more detail the recording mechanism housed in a framestructure 30. This mechanism comprises a recording cathode-ray tube 31having a display device such as a fiber optics faceplate 32. Thiscathode-ray tube 31 is fastened onto the inner surface of the framestructure through a supporting member 33. A pressure .pad 34 is providedina manner to face the faceplate 32 of the cathode-ray tube 31 forpressing against the faceplate a recording medium 35 on which a videoimage should be recorded. On one side surface of the pressure pad 34facing the faceplate 32 is provided a suitable member 36 such as aplurality of stiff bristles for the purpose of protecting the recordingmedium 35. The pressure pad 34 is connected at the other side surface toa substantially cylindrical rod 37 which is slidably coupled with ahollow cylindrical member 38 fixed to a supporting rod 39. Thissupporting rod 39 is mounted on the frame structure 30' through suitablemeans such as screws. A coil spring 40 is provided surrounding thecylindrical rod 37 and seated on the pressure pad 34 and the hollowcylindrical member 38 for applying through the pressure pad 34 to therecording medium 35 a suitable pressure toward the faceplate 32.

The area of the side surface of the pressure pad 34 may preferably begreater than that of the faceplate 32 of recording cathode-ray tube 31.The recording medium 35 is sensitive to a radiation from a video imageproduced on the faceplate. In the present embodiment, the recordingmedium 35 is provided in the form of a paper roll 41 and fed through aguide member 42 and a pair of idler rollers 43 and 43', thereby beingpassed between the faceplate 32 and the pressure pad 34.

The recording medium 35 passed between the faceplate 32 and the pressurepad 34 is passed between a pair of drive rollers 44 and 44' which aredriven by suitable means such as an electrical motor (not shown) therebyfeeding the recording medium 35 as desired. The recording medium 35 thuspassed between the drive rollers 44 and 44 is then fed through a guidemember 45 to a processor 46 for developing and fixing the video imagerecorded thereomThe thus processed recording medium 35 is then deliveredto the outside through an aperture 47 formed in the frame structure 30preferably via a roller 48 for being turned upside down for conveniencein visual observation.

FIG. 4 shows a preferred circuit arrangement of the control means forthe recording apparatus shown in FIGS. 1,2 and 3. This circuitarrangement comprises a usual tuner 50 for a TV video signal whichselectively receives a TV video signal through a suitable means such asan antenna. The video image signal selected by the tuner 50 is appliedthrough a line 51 to a high frequency amplifier 52. The amplified videoimage signal from the amplifier 52 is applied through a line 53 to adetector 54 for detecting the video signal therein. The thus detectedvideo signal is applied through a line 55 to a video amplifier 56. Thevideo signal from the amplifier 56 is applied through a line 57 to afirst grid, for example, of a display device such as'the cathode-raytube 31.

In this instance, it should be noted that any video image signals otherthan the TV video signal, are available for the particular recordingapparatus if these signals have synchronizing signal components.

To an anode of the recording cathode-ray tube is applied a high voltagefrom a high voltage source (not shown) so as to accelerate an electronbeam emitted from an electron gun (not shown) toward the faceplate. Thiselectron beam is intensity-modulated by the video image signal appliedthereto.

The output video image signal from the video amplifier is also appliedthrough a line 58 to the picture tube 12 which reproduces the same videoimage as that reproduced on the cathode-ray tube 32. The video imagereproduced on the faceplate of the picture tube 12 is visually observedfor selecting a suitable video image and appropriately controlling thecathode-ray tube 31. The output signal from the video amplifier 56 isfurther applied through a line 59 to separating means including aseparator 60 which separates the synchronizing signal from the outputvideo image signal. The thus separated synchronizing signal includinghorizontal and vertical synchronizing pulses is applied through a line61 to a first deflector 62 and through a line 63 to a second deflector64. These deflectors 62 and 64 produce vertical and horizontaldeflection signals in accordance with the synchronizing signal. Thedeflection signals are applied to deflecting coils 65 and 66 of both ofthe tubes 31 and 12, respectively, so as to vertically and horizontallydeflect the electron beams to reproduce on the faceplates the videoimage carried by the image signal applied through lines 57 and 58,respectively.

The vertical synchronizing signal, on the other hand, is applied througha line 67 to a single-frame gate controller 68 which produces asingle-frame gate signal in accordance with the horizontal synchronizingsignal only when it receives a start signal through a line 69 from astart switch 70. This single-frame gate signal is used for actuating anON-OFF gate 71 provided between a dc. voltage source 72 and a secondgrid, for example, of the cathode-ray tube 31. This ON-OFF gate 71 thencloses its own circuit so as to supply a voltage from the source 72through lines 73 and 74, to the second grid thereby to raise thepotential of the second grid. As the potential of the second grid israised, the electron beam is substantially permitted to pass through thesecond grid whereby a selected frame of a video image is reproduced onthe faceplate 32 of the recording cathode-ray tube 31. On the otherhand, the voltage from the source 72 is constantly applied through aline 75 to the picture tubev 12 so as to constantly reproduce the videoimage carried by the video image signal for providing pertinentlycontrolled contrast, intensity, focus, etc. of the video image to berecorded. A neon lamp 76 is provided, which is connected at one terminalto the line 74 and is grounded at the other terminal and glows when thegate 71 re mains closed thereby to indicate the moment at which thevideo image is recorded.

The start switch 71 is manually or automatically operated so as toproduce a start signal, which is applied through the line 69 to thesingle-frame gate controller 68 and through a line 77 to the feedmotorcontroller 78 thereby starting them. The feed motor controller 78produces a drive signal upon termination of a time duration sufficientlylonger than the pulse width of the gate signal produced by thesingle-frame gate after the start signal has triggered the motorcontroller 78. The drive signal is applied through a line 79 to a feedmotor actuator 80 which then actuates a feed motor to exert a feedingforce on the drive rollers or other feeding elements of the recordingmechanism 20 shown in FIG. 3.

If desired, the single-frame gate controller 68 and the motor controller78 may be arranged to co-operate .5 with each other so as to permit ofrepeated recording operation of the recording mechanism 20.

The fiber optics cathode-ray tube may be replaced with other types ofcathode-ray tube such as a cathoderay pin tube, if preferred. V I

H6. shows a preferred form of the singleframe gate controller 68 of FIG.4, which comprises a onehalf-frequency divider 90 connected to theseparator 60. One output terminal of the divider 90 is connected througha line 91 to one inputterminal of an AND gate 92 and the other outputterminal'connected through a line 93 to a set terminal of a flip-flop94. To the other terminal of the AND. gate 94 through a line 95 isconnected a monostable multivibrator 96 having an input terminal whichis connected to the start switch 70. An output terminal of the AND gateis connected through a line 97 to a reset terminal of the flip-flop 94having an output terminal which is connected through a line 98 to adriver 99. The driver 99 is adapted to produce a drive signal of acurrent great enough to energize the ON-OFF gate 71. This ON-OFF gate 71may be a'suitable switching device such as a relay or a transistor.

FIG. 6 shows the operation of the single-frame gate controller of FIG.5.

When a video image signal containing the synchronizing signal isreceived as shown at (a), the separator 70 separates the horizontalsynchronizing pulse signal from the video image signal as shown at (b).This synchronizing pulse train is applied to the one-half-divider 90which produces an output pulse signal having a repetition frequency onehalf lower than that of the input synchronizing pulse train,which-output pulse signal is shown at (c). This output pulse signal isapplied through the line 91 to the one terminal of the AND gate 92 andalso applied through the line 93 to the reset terminal of the flip-flop94. In this instance, when the start switch 70 is actuated, the switch70 produces a start signal which is applied to the monostablemultivibrator 96 whereby producinga pulse signal as shown at (d). Thepulse signal shown at (d) is applied through the line 95 to the otherterminal of the AND gate 92, whereby one pulse indicated by A in thepulse train (0) which happens'to appear on the line 91 during the pulsesignal shown at( d) is permitted to pass through the AND gate 92 andthen appears on the line 97 as shown at (e). This pulse A now havingappeared on the line 9'7 triggers the flip-flop 94 to change its state.Thereafter, the pulse indicated by B next tothe pulse indicated by A isapplied through the line 94 to the reset terminal thereby to return theflip-flop 94 so that a pulse signal shown at. (1) having a pulse widthequal to the pulse duration between the pulses A and B appears on theline 98 and is applied to the driver gate 99.

The driver gate 99 which is supplied with this pulse signal acts toclose the gate 71 so as to permit the voltage from the power source 72to be impressed on the second grid of the cathode-ray tube 31.

A preferred circuit arrangement of the motor controller 78 of FIG. 4 isshown in FIG. 7. This circuit arrangement comprises a d.c. power sourcehaving positive and negative terminals respectively connected topositive and negative bus lines 111 and 112. To the positive bus line111 is connected through a line 113 one terminal of a resistor R theother terminal of which is connected through a line 114 to one terminalof a capacitor (3,. The other terminal of the capacitor C, is connectedthrough a line 115 to one terminal of a relay coil TMl theother terminalof which is connected through a line 116 to the negative bus line 112.The other terminal of the capacitor C, is also connected through a line117 to an anode terminal of a diode D the cathode terminal of which isconnected through a line 118 to the negative bus line 112. The

other terminal of the resistor R is also connected through a line 119 toa movable contact st. of a start switch ST which is actuated by thestart signal from the start switch 70. A make contact st.,,, of thestart switch ST is connected through a line 120 to the negative bus line112.

To the positive bus line 111 through a line 121 one terminal of a secondresistor R the other terminal of which is connected through a line 122to one terminal of a capacitor C The other terminal of the capacitor Cis connected through a line 123 to one terminal of a second relay coilTM2 the other terminal of which is connected through a line .124 to thenegative bus line 1 12. The other terminal of the capacitor C is alsoconnected through a line 125 to an anode terminal of a second diode Dthe cathode terminal of which is connected through a line 126 to thenegative bus line 112. The other terminal of the resistor R is alsoconnected through lines 127 and 128 to movable contacts tmland m2. ofrelays TM! and TM2. Make contacts tm1.,,, and tm2.,,, respectivelycorresponding to the movable contacts tml and tm2. are connected throughlines 129 and 1 30 to the negative bus line 112.

To the positive bus line 111 through a line 131 is connected oneterminal of a resistor R the other terminal of-which is connectedthrough a line 132 to one terminal of a third capacitor C The otherterminal of the capacitor C is connected through a line 133 to oneterminal of a relay coil TM3 the other terminal of which is connectedthrough a line 134 to the negative bus line 112. The other terminal ofthe capacitor C is also connected through a line 135 to an anodeterminal of a diode D the cathode terminal of which is connected througha line 136 to the negative bus line 112. The other terminal of theresistor R 'is connected through lines- 127 and 128 to movable contactstml and tml of relays TMl and TMB, Make contacts tmL and tm3.,,,.respectively corresponding to the stationary contacts 111.2; and tmS.are connected through lines 139 and 140 to the negative bus line 112'.

One terminal of a relay coil CT is connected through" a line 141 to amake contact tm3. associated with the relay coil TM3 and through. a line142 to a make contact ca A movable contact tmii is connected through aline 143 to a break contact trim- A station= ary contact tmZ isconnected through a line 144 to a movable contact ct. and through a line145 to the pos= itive bus line 111. The other terminal of the relay coilTM3 is connected through a line 146 to a make contact tm3.=,,,. andthrough a line 147 to a break contact of a switch SP which is actuatedby a suitable means when the recording medium is sufficiently fed.Movable With reference to FIG. 8, the operation of the circuit of FIG. 7is described herebelow.

FIG. 8 shows operations of the start switch ST, relay TMl, TM2, TM3, CT,and switch SP of the circuit of FIG. 7 in termsof time.

When the start switch ST is opened, a current flows from the positivebus line 111, resistor R capacitor C and diode D to the negative busline 112 until the capacitor C is fully charged. The capacitors C and Con the other hand, are fully charged in similar manners.

When the start switch ST is actuated to close at a time T as shown at(a), the charge stored in the capacitor C is discharged through thestart switch ST, and relay coil TMl, so that the relay coil TMl isenergized by the discharge current during a time period T, and T asshown at (b). Now that the relay TMl is actuated, the contacts t1.,,,,are connected so that the charge stored in the capacitor C is dischargedthrough the contacts t1. and t1.,,,, and the relay coil TM2 whereby therelay coil TM2 is energized by the discharge current therethrough duringa time period T to T as shown at (c). The time period is established byselecting the capacitance of the capacitor C so as to be sufficientlylarger than the time period of the single-frame. The contacts tml andtm1. are also connected so that the charge stored in the capacitor C isdischarged through the contacts ml. and tm1. whereby the relay coil TM3is energized by the discharge current during a time period from T, toTM4 as shown at (d). The time period is established to be larger thanthe time period T to T and the time period from T to T is large enoughto actuate the relay CT. At the time T the relay TM2 is inoperative butthe relay TM3 maintains operative so that a current flows from thepositive bus line 111 through the contacts tm2 and tm3 the coil CT andthe parallel connection SP and tm3 to the negative bus line 112 wherebythe relay CT is operated as shown at (e). Therefore, a positive voltagesignal through the contacts ct appears at the terminal 150 and isapplied to the motor actuator 80 thereby to actuate the feed motor. Whenthe recording medium is sufficiently fed, for example, at a time T thestop switch SP is operated to open the contacts SP and de-energize therelay CT since the relay TM3 has been released to open the contacts t3.

FIG. 9 shows a modified form of the circuitarrangement of FIG. 4 whereinthe video amplifier 56 is replaced with a amplifier 56' having terminals160 and 161 through one terminal 160 of which a normal image signalhaving the same polarity as the original signal introduced through thedetector appears and through the other terminal 161 an inverted imagesignal having a reverse polarity relative to the normal image signalappears. The two terminals 160 and 161 are connected to break and makecontacts 162 and 163 of a change-over switch 164. A movable contact 165of the switch 164 is connected through a line 57 to a fiber opticscathoderay tube 31. The other elements of this circuit are connectedwith one another as in the circuit of FIG. 4.

In operation, when the switch 164 is not actuated and the contacts 162and 165 are connected with each other, the normal image signal isapplied through the line 57 to the cathode-ray tube 31 so that a normalvideo image is reproduced on the faceplate 32. When the switch 164 isactuated and the contacts 163 and 165 are connected to each other, theinverted signal is applied to the cathode-ray tube 31 so that aninverted image is reproduced on the faceplate 32.

FIG. 10 shows a preferred form of the video amplifier 56' of FIG. 9,which comprises an input amplifier adapted to amplify a video imagesignal applied thereto through the line 55. The output terminal of theinput amplifier 170 is connected through a line 171 to an inverter 172which inverts the voltage porality of its input signal.

One output terminal of the inverter 172 is connected through a line 173to a separator 174 which separates a synchronizing signal from its inputsignal. Two output terminals of the separator 174 are respectivelyconnected through lines 175 and 176 to horizontal and verticalseparators 177 and 178 which respectively separate horizontal andvertical synchronizing pulse signals. Output terminals of the horizontaland vertical separator are respectively connected through lines 179 and180 to horizontal and vertical blanking pulse generators 181 and 182 theoutput terminals of which are respectively connected through lines 183and 184 to input terminals of a first mixer 185. Two output terminals ofthe first mixer 185 are respectively connected through lines 186 and 187to input terminals of second and third mixers 188 and 189. The otherinput terminal of the second mixer 188 is connected through a line 190to the other output terminal of the inverter 172. The output terminal ofthe second mixer 188 is connected through a line 191 to one outputterminal 161 of the video amplifier 56. The other input terminal of thethird mixer 189 is connected through a line 192 to the line 171, and theoutput terminal of the third mixer 189 is connected through a line 193to the other output terminal 160.

When, in operation, a video image signal containing synchronizing pulsesis applied to the input amplifier 170, the video image signal isamplified and applied through the line 171 to the inverter which thenproduces on its two output terminals an inverted image signal having anvoltage polarity inverse to that of the input image signal. The invertedimage signal is applied through the line 173 to the separator 174 whichseparates the synchronizing pulses. These synchronizing pulses are thenapplied through the line 175 to the horizontal separator 177 and throughthe line 176 to the vertical separator 178. The horizontal synchronizingpulse separated by the horizontal separator 177 is applied through theline 179 to the horizontal blanking pulse generator 181 which thengenerates a horizontal blanking pulse then to be applied through theline 183 to one terminal of the first mixer 185. The vertical sep'arator 178 separates the vertical synchronizing pulses which are thenapplied through the line 1.80 to the vet tical blanking pulse generator182. The blanking pulse generator 182 then produces a vertical blankingpulse which is applied through the line 184 to the other ter-- minal ofthe first mixer 185. The mixed output signal from the first mixer 185 isa mixed blanking signal of horizontal and vertical blanking pulse signalwhich is then applied through the line 186 to one terminal of the secondmixer 188. To the other terminal of the second mixer 188 is appliedthrough the line 1.90 the inverted video image signal which is thenmixed with the mix d blanking signal and appears on the line 1 1. Themixed blanking signal is also applied through the line 187 to oneterminal of the third mixer 18.9. To the other terminal of the thirdmixer 189 through th line 192 is applied the supplied video signal whichis then mixed with the mixed blanking signal and appears on the line192.

In this instance, it should be noted that since the blanking pulseformed by this video amplifier 56 is derived from the synchronizingpulse, the leading edge of the thus formed blanking pulse is delayedfrom the leading edge of the original blanking pulse contained in thesupplied video image signal. Since, furthermore, the blanking pulse isinverted, the blanking pulse has a white level so that a bright lineappears at the hatched areas, indicated by character C, of the faceplate32 shown in FIG. 11. To avoid production of such bright lines, thephosphorous layer should be deviated to a position surrounded by abroken line D.

FIG. 12 shows a modified form of the circuit of FIG. 4, wherein agamma-corrector 200 of any known type is interposed between the switch164 and the line 157 so as to have the intensityof the electron beammodulated in accordance with. the characteristics of the recordingmedium pressed upon'the faceplate 32.

FIG. 13 shows another modified form of the circuit of FIG. 4, wherein arepeater 201 is interposed between the switch 164 and the line 157. Thisrepeater 201 memorizes the image signal and then delivers the memorizedimage signal repeatedly several times which are determined in compliancewith the sensitivity of the recording medium so as to sufficiently havethe recording medium exposed to the video image.

F 1G 14 illustrates a further modified form of the circuit of FIG. 4,wherein a normally-open switch is provided in parallel with the gate 71.The switch 202 is useful where a video image signal carrying a staticvideo image should be recorded, wherein the switch 202 is kept closedeven after the gate 71 has been opened. This switch 202 may be usedotherwise in regulating the astigmatism, sweeptiming, intensity andfocus, horizontal and-vertical position and so on of the recordingcathode-ray tube 25.

FIG. 15 shows still further modified form of the circuit of FIG. 4,wherein the deflector 62 provided with three output contact terminals204, 205 and 206 on which corresponding deflectionsignals producedhaving various amplitudes and bias levels. These terminals 205, 206 and207 are selected by a' movable contact 207 which is connected to thedeflection coil 65. When such a video image as shown in FIG. 16 (a) isapplied to this circuit, the video image is partly reproduced on thefaceplate on an enlarged scale as shown in FIG. 16 (b) or (c) accordingto a deflection signal on either ter minal 204, 205 or 206 selected bythe movable contact 207.

FIG. 17 shows a still further modified form of the circuit of .FIG. 4wherein the deflector 62 has two output terminals 210 and 211 throughwhich two deflection signals having polarities, which are inverse toeach other. Through provision of such deflector 62, horizontallyinverted video images can be produced by selectively switching theselecting movable contact 212 between the two positions.

FIG. 18 shows a still further modified form of the circuit of FIG. 4,wherein the recording tube 31 is provided with an additional electrongun (not shown). To a grid associated with the additional electron gunis connected a video signal generator2l3 which produces a video signalcarrying a piece of information such as advertising phrases when it isenergized through a line 214 by the single-frame gate 68.

It should now be understood that, although only one cathoderay tube hasbeen used in the above-described embodiments, a plurality of recordingcathode-ray tube may be used.

Furthermore, the picture tube may be replaced with any other monitoringtube ormay be removed in some cases.

What is claimed is:

l. A video image recording system for selectively recording one or morevideo images comprising: means receptive in use of video signals havingsynchronizing pulse signals each signal corresponding in time to adiscrete frame comprising a plurality of fields and in which a videoimage is to be displayed: separating means for separating saidsynchronizing pulse signals from said video signals; a display devicefor displaying a video image in said discrete frame when enabledcomprising means receptive of said video signals for converting saidvideo signals to video images; start switch means for selectivelygenerating a start signal when a selected video image is to be recorded;singleframe gate means receptive of said synchronizing pulse signals andresponsive to said start signal for enabling displaying of said selectedvideo image in said discrete frame on said display device; and recordingrileans for recording all of said plurality of fields of said discreteframe of said selected video image displayed on said display deviceincluding feed means for feeding a recording medium when enabled andfeed control means receptive of said start signal for enabling said feedmeans after all of said plurality of fields of said discrete frame ofsaid selected video imagehave been recorded.

2. A video image recording system according to claim 1, wherein saidsingle-frame gate means comprises means co-active with said feed controlmeans thereby to record successive video images on successive discreteframes on said recording medium.

3. A video image recording system according to claim 1, wherein saidsingle-frame gate means comprises a one-half-frequency divider receptiveof said synchronizing pulse signals for producing pulse signals having arepetition frequency one-half that of said synchronizing pulse signals,a monostable multivibrator receptive of said start signal from saidstart switch means for producing a trigger signal having a preselectedpulse width, and AND gate connected to said one-half-frequency dividerandsaid monostable multivibrator for passing said pulse signal from saidone-halffrequency divider therethrough when supplied with said startsignal from said monostable multivibrator, a flip-flop connected to saidAND gate and said one-halffrequency divider for producing a single-framepulse" signal having a pulse width equal to aduration between theleading edges of said pulse passed through said AND gate and asucceeding pulse of said pulse passed through said AND gate, a drivergate receptive of said single-frame pulse signal from said flip-flop forproducing a drive signal having a pulse width equal to that of saidsingle-frame pulse signal, gate means receptive of said drive signalfrom said driver gate and a voltage source connected to said gate meansfor applying a voltage signal therethrough when said gate means re- 7ceives said drive signal.

1. A video image recording system for selectively recording one or morevideo images comprising: means receptive in use of video signals havingsynchronizing pulse signals each signal corresponding in time to adiscrete frame comprising a plurality of fields and in which a videoimage is to be displayed: separating means for separating saidsynchronizing pulse signals from said video signals; a display devicefor displaying a video image in said discrete frame when enabledcomprising means receptive of said video signals for converting saidvideo signals to video images; start switch means for selectivelygenerating a start signal when a selected video image is to be recorded;single-frame gate means receptive of said synchronizing pulse signalsand responsive to said start signal for enabling displaying of saidselected video image in said discrete frame on said display device; andrecording means for recording all of said plurality of fields of saiddiscrete frame of said selected video image displayed on said displaydevice including feed means for feeding a recording medium when enabledand feed control means receptive of said start signal for enabling saidfeed means after all of said plurality of fields of said discrete frameof said selected video image have been recorded.
 2. A video imagerecording system according to claim 1, wherein said single-frame gatemeans comprises means co-active with said feed control means thereby torecord successive video images on successive discrete frames on saidrecording medium.
 3. A video image recording system according to claim1, wherein said single-frame gate means comprises a one-half-frequencydivider receptIve of said synchronizing pulse signals for producingpulse signals having a repetition frequency one-half that of saidsynchronizing pulse signals, a monostable multivibrator receptive ofsaid start signal from said start switch means for producing a triggersignal having a pre-selected pulse width, an AND gate connected to saidone-half-frequency divider and said monostable multivibrator for passingsaid pulse signal from said one-half-frequency divider therethrough whensupplied with said start signal from said monostable multivibrator, aflip-flop connected to said AND gate and said one-half-frequency dividerfor producing a single-frame pulse signal having a pulse width equal toa duration between the leading edges of said pulse passed through saidAND gate and a succeeding pulse of said pulse passed through said ANDgate, a driver gate receptive of said single-frame pulse signal fromsaid flip-flop for producing a drive signal having a pulse width equalto that of said single-frame pulse signal, gate means receptive of saiddrive signal from said driver gate and a voltage source connected tosaid gate means for applying a voltage signal therethrough when saidgate means receives said drive signal.
 4. A video image recording systemaccording to claim 1, wherein said feed control means comprises a d.c.power source having a positive and a negative terminal, a first relaytiming circuit including a first resistor connected at one terminal tosaid positive terminal of said d.c. power source, a first capacitor, afirst relay coil having a normally-closed contact pair and anormally-open contract pair and having one terminal of the first coilconnected through said first capacitor to the other terminal of saidfirst resistor and the other terminal of said first coil connected tosaid negative terminal of said power source, a first diode shunting saidfirst relay coil and forward-directed from said one terminal to saidother terminal of said first coil, and a normally-open switch connectedto said other terminal of said first resistor and said negative terminaldischarging said first capacitor therethrough when actuated by saidstart signal from said start switch means; a second relay timing circuitincluding a second resistor connected at one terminal to said positiveterminal, a second capacitor, a second relay coil having fournormally-open contact pairs and having one terminal connected throughsaid second capacitor to the other terminal of said second resistor andthe other terminal connected to said negative terminal, a second diodeshunting said second coil and forward-directed from said one terminal tosaid other terminal of said second coil, and said normally-opencontact-pairs associated with said first coil and one normally-opencontact pair of said second coil both connected between the otherterminal of said second resistor and said negative terminal fordischarging said second capacitor therethrough when closed; a thirdrelay timing circuit including a third resistor connected at oneterminal to said positive terminal, a third capacitor, a third relaycoil having a normally-open contact pair and having one terminalconnected through said third capacitor to the other terminal of saidthird resistor and the other terminal connected to said negativeterminal, a third diode shunting said third coil and forward-directedfrom said one terminal to said other terminal of said third coil, andthe second normally-open contact-pair associated with said second coiland said normally-open contact-pair associated with said third coil bothconnected between said other terminal of said third resistor and saidnegative terminal for discharging said third capacitor therethrough whenclosed; a fourth relay timing circuit including a fourth relay coilhaving a normally-open contact-pair, one terminal of said fourth relaycoil being connected to said positive terminal through a parallelconnection of said normally-open contact-pair of said fourth coil and aseries connection of The third normally-open contact-pair associatedwith said second coil and said normally-closed contact-pair associatedwith said first coil, and the other terminal of said fourth relay coilbeing connected to said negative terminal through a parallel connectionof the fourth normally-open contact-pair associated with said secondcoil and switch means for opening in response to said recording mediumbeing fed a predetermined length, and said normally-open contact-pairassociated with said fourth relay coil and connected to said positiveterminal for producing an output voltage signal when said fourth coil isenergized.
 5. A video image recording system according to claim 1,further comprising a normally-open switch connected in parallel withsaid single frame gate means by-passing said gate means.